Mac app
Download MockItUp
Unzip it. Drag it to Applications. The first open is a right-click, not a double-click.
One zip. Apple silicon and Intel. macOS 26.
Download MockItUp.zip- 01
Unzip the file
Safari usually puts MockItUp.zip in Downloads. Double-click it. You should get MockItUp.app, not a disk image.
- 02
Move it to Applications
Drag MockItUp into Applications. Opening it from Downloads works once, then macOS gets picky.
- 03
Right-click, then Open
This build is not from the App Store. The first launch is Control-click the app, choose Open, then Open again.
If macOS blocks it
That warning is Gatekeeper, not a virus scan. MockItUp is not notarized yet, so Apple has not countersigned the file. Open System Settings → Privacy & Security, scroll to the message about MockItUp, and click Open Anyway.
Mac types
The same zip contains arm64 and x86_64. M-series Macs run it native. Intel Macs run it native. There is no separate “Intel build” to pick. You do need macOS 26.